/*

 * Copyright (c) 2002-2012 Alibaba Group Holding Limited.

 * All rights reserved.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *    http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



package com.alibaba.citrus.service.velocity.impl;



import static com.alibaba.citrus.springext.util.DomUtil.*;

import static com.alibaba.citrus.springext.util.SpringExtUtil.*;

import static com.alibaba.citrus.util.Assert.*;

import static com.alibaba.citrus.util.StringUtil.*;



import java.util.List;

import java.util.Map;



import com.alibaba.citrus.springext.ConfigurationPoint;

import com.alibaba.citrus.springext.Contribution;

import com.alibaba.citrus.springext.ContributionAware;

import com.alibaba.citrus.springext.support.parser.AbstractSingleBeanDefinitionParser;

import org.springframework.beans.factory.support.BeanDefinitionBuilder;

import org.springframework.beans.factory.xml.ParserContext;

import org.w3c.dom.Element;



public class VelocityEngineDefinitionParser extends AbstractSingleBeanDefinitionParser<VelocityEngineImpl> implements

                                                                                                           ContributionAware {

    private ConfigurationPoint pluginsConfigurationPoint;



    public void setContribution(Contribution contrib) {

        this.pluginsConfigurationPoint = getSiblingConfigurationPoint("services/template/engines/velocity/plugins",

                                                                      contrib);

    }



    @Override

    protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {

        attributesToProperties(element, "configuration.", builder, "path", "cacheEnabled", "modificationCheckInterval",

                               "strictReference", "templateEncoding");



        ElementSelector globalMacros = and(sameNs(element), name("global-macros"));

        ElementSelector plugins = and(sameNs(element), name("plugins"));

        ElementSelector advancedProperties = and(sameNs(element), name("advanced-properties"));



        for (Element subElement : subElements(element)) {

            if (globalMacros.accept(subElement)) {

                parseGlobalMacros(subElement, parserContext, builder);

            } else if (plugins.accept(subElement)) {

                parsePlugins(subElement, parserContext, builder);

            } else if (advancedProperties.accept(subElement)) {

                parseAdvancedProperties(subElement, parserContext, builder);

            }

        }

    }



    private void parseGlobalMacros(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {

        List<Object> macros = createManagedList(element, parserContext);



        for (Element subElement : subElements(element, and(sameNs(element), name("name")))) {

            String name = trimToNull(subElement.getTextContent());



            if (name != null) {

                macros.add(name);

            }

        }



        builder.addPropertyValue("configuration.globalMacros", macros);

    }



    private void parsePlugins(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {

        List<Object> plugins = createManagedList(element, parserContext);



        for (Element subElement : subElements(element)) {

            plugins.add(parseConfigurationPointBean(subElement, pluginsConfigurationPoint, parserContext, builder));

        }



        builder.addPropertyValue("configuration.plugins", plugins);

    }



    private void parseAdvancedProperties(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {

        Map<Object, Object> props = createManagedMap(element, parserContext);



        for (Element subElement : subElements(element, and(sameNs(element), name("property")))) {

            String name = assertNotNull(trimToNull(subElement.getAttribute("name")), "propertyName");

            String value = trimToEmpty(subElement.getAttribute("value"));



            props.put(name, value);

        }



        builder.addPropertyValue("configuration.advancedProperties", props);

    }

}